14
Inventory of Innovative Indoor Smoke
Alleviating Technologies in Nepal
Year of dissemination
Cost
Quantity disseminated
Technological description
Early 90s onwards
NRs. 150 to 250 (but varies with size, base construction and
geographical location)
More than 200,000 from 2000 onwards were disseminated after
improvement in chimney and combustion chamber (by NICSP
supported by ESAP and coordinated by AEPC). The second pothole
raised model is more accepted because of better combustion and
suitability for using two bigger pots. These types of stoves cover
more than 85 per cent of total disseminated mud-brick ICS.
These stoves have only one fuel inlet below the first pothole. A baffle
is used at 60ยบ to the horizontal and its peak point lies just below the
second pothole so that the flame and hot gas is directed to the
bottom of the second pot. The construction of baffle is shown in
Figure 3.7.
Figure 3.7: Baffle in two potholes mud-brick stove
Two potholes stove with grate facilitates increased combustion
efficiency with proper air circulation (air is pre-heated before reaching
to the fuel). The provision of grate makes the stove more suitable to
use agricultural residues and facilitate ash collection. It is
recommended to rotate pots while cooking to prevent smoke leakage.
Metal chimney can also be used in mud-brick stoves. In temperate
climate, metal tin is placed in the second pothole for space heating.
Figure 3.8 shows ICS with metal chimney and use of metal tin for
space heating.
Figure 3.8: Metal chimney and use of tin for space heating
If rear pothole is not used for cooking/heating, it is advisable to use
this pothole for water heating or to cover it as shown in Figure 3.9.